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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A272301 Number of set partitions of [n] such that for each pair of blocks (b,c) with b at least one pair of consecutive numbers (i,i+1) exists with i member of b and i+1 member of c or i member of c and i+1 member of b.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 9
5 23
6 66
7 204
8 664
9 2273
10 8283
11 32463
12 136434
13 605848

List of values

[1, 1, 2, 4, 9, 23, 66, 204, 664, 2273, 8283, 32463, 136434, 605848]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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